rails/rails — pull request #9240 by tricknotes (2013-02-10 17:32:05+00:00)
Title: Supress warning about method redifinition

In i18n gem, the following methods are defined.
- `Hash#except`
- `Hash#slice`

But if there are defined already, i18n skips these definitions.
So these definition by `active_support` are required before `require 'i18n'`.